ICD-10-CM Code M21.17

Varus deformity, not elsewhere classified, ankle

Version 2020 Non-Billable Code

Not Valid for Submission

M21.17 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of varus deformity, not elsewhere classified, ankle. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:M21.17
Short Description:Varus deformity, not elsewhere classified, ankle
Long Description:Varus deformity, not elsewhere classified, ankle

Consider the following ICD-10 codes with a higher level of specificity:

  • M21.171 - Varus deformity, not elsewhere classified, right ankle
  • M21.172 - Varus deformity, not elsewhere classified, left ankle
  • M21.179 - Varus deformity, not elsewhere classified, unspecified ankle

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code M21.17 are found in the index:


Code Classification

  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Other joint disorders (M20-M25)
      • Other acquired deformities of limbs (M21)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


Ankle Injuries and Disorders

Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.

The most common ankle problems are sprains and fractures. A sprain is an injury to the ligaments. It may take a few weeks to many months to heal completely. A fracture is a break in a bone. You can also injure other parts of the ankle such as tendons, which join muscles to bone, and cartilage, which cushions your joints. Ankle sprains and fractures are common sports injuries.


[Learn More]